[Intel-gfx] [PATCH] drm/i915/icp: Add Interrupt Support
Lucas De Marchi
lucas.de.marchi at gmail.com
Wed Jun 27 05:57:14 UTC 2018
On Tue, Jun 26, 2018 at 1:56 PM Anusha Srivatsa
<anusha.srivatsa at intel.com> wrote:
>
> This patch addresses Interrupts from south display engine (SDE).
>
> ICP has two registers - SHOTPLUG_CTL_DDI and SHOTPLUG_CTL_TC.
> Introduce these registers and their intended values.
>
> Introduce icp_irq_handler().
>
> The icp_irq_postinstall() takes care of
> enabling all PCH interrupt sources, to unmask
> them as needed with SDEIMR, as is done
> done by ibx_irq_pre_postinstall() for earlier platforms.
> We do not need to explicitly call the ibx_irq_pre_postinstall().
>
> Also, while changing these,
> s/CPT/PPT/CPT-CNP comment.
>
> v2:
> - remove redundant register defines.(Lucas)
> - Change register names to be more consistent with
> previous platforms (Lucas)
>
> v3:
> -Reorder bit defines to a more appropriate location.
> Change the comments. Confirm in the commit message that
> icp_irq_postinstall() need not go to
> ibx_irq_pre_postinstall() and ibx_irq_postinstall()
> as in earlier platforms. (Paulo)
>
> Cc: Lucas De Marchi <lucas.de.marchi at gmail.com>
Better now.
Reviewed-by: Lucas De Marchi <lucas.demarchi at intel.com>
Lucas De Marchi
> Cc: Paulo Zanoni <paulo.r.zanoni at intel.com>
> Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com>
> Cc: Ville Syrjala <ville.syrjala at linux.intel.com>
> Signed-off-by: Anusha Srivatsa <anusha.srivatsa at intel.com>
> [Paulo: coding style bikesheds and rebases].
> Signed-off-by: Paulo Zanoni <paulo.r.zanoni at intel.com>
> ---
> drivers/gpu/drm/i915/i915_irq.c | 134 +++++++++++++++++++++++++++++++++++++++-
> drivers/gpu/drm/i915/i915_reg.h | 42 ++++++++++++-
> 2 files changed, 173 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> index 46aaef5..7a7c4a2 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -122,6 +122,15 @@ static const u32 hpd_gen11[HPD_NUM_PINS] = {
> [HPD_PORT_F] = GEN11_TC4_HOTPLUG | GEN11_TBT4_HOTPLUG
> };
>
> +static const u32 hpd_icp[HPD_NUM_PINS] = {
> + [HPD_PORT_A] = SDE_DDIA_HOTPLUG_ICP,
> + [HPD_PORT_B] = SDE_DDIB_HOTPLUG_ICP,
> + [HPD_PORT_C] = SDE_TC1_HOTPLUG_ICP,
> + [HPD_PORT_D] = SDE_TC2_HOTPLUG_ICP,
> + [HPD_PORT_E] = SDE_TC3_HOTPLUG_ICP,
> + [HPD_PORT_F] = SDE_TC4_HOTPLUG_ICP
> +};
> +
> /* IIR can theoretically queue up two events. Be paranoid. */
> #define GEN8_IRQ_RESET_NDX(type, which) do { \
> I915_WRITE(GEN8_##type##_IMR(which), 0xffffffff); \
> @@ -1586,6 +1595,34 @@ static bool bxt_port_hotplug_long_detect(enum port port, u32 val)
> }
> }
>
> +static bool icp_ddi_port_hotplug_long_detect(enum port port, u32 val)
> +{
> + switch (port) {
> + case PORT_A:
> + return val & ICP_DDIA_HPD_LONG_DETECT;
> + case PORT_B:
> + return val & ICP_DDIB_HPD_LONG_DETECT;
> + default:
> + return false;
> + }
> +}
> +
> +static bool icp_tc_port_hotplug_long_detect(enum port port, u32 val)
> +{
> + switch (port) {
> + case PORT_C:
> + return val & ICP_TC_HPD_LONG_DETECT(PORT_TC1);
> + case PORT_D:
> + return val & ICP_TC_HPD_LONG_DETECT(PORT_TC2);
> + case PORT_E:
> + return val & ICP_TC_HPD_LONG_DETECT(PORT_TC3);
> + case PORT_F:
> + return val & ICP_TC_HPD_LONG_DETECT(PORT_TC4);
> + default:
> + return false;
> + }
> +}
> +
> static bool spt_port_hotplug2_long_detect(enum port port, u32 val)
> {
> switch (port) {
> @@ -2385,6 +2422,43 @@ static void cpt_irq_handler(struct drm_i915_private *dev_priv, u32 pch_iir)
> cpt_serr_int_handler(dev_priv);
> }
>
> +static void icp_irq_handler(struct drm_i915_private *dev_priv, u32 pch_iir)
> +{
> + u32 ddi_hotplug_trigger = pch_iir & SDE_DDI_MASK_ICP;
> + u32 tc_hotplug_trigger = pch_iir & SDE_TC_MASK_ICP;
> + u32 pin_mask = 0, long_mask = 0;
> +
> + if (ddi_hotplug_trigger) {
> + u32 dig_hotplug_reg;
> +
> + dig_hotplug_reg = I915_READ(SHOTPLUG_CTL_DDI);
> + I915_WRITE(SHOTPLUG_CTL_DDI, dig_hotplug_reg);
> +
> + intel_get_hpd_pins(dev_priv, &pin_mask, &long_mask,
> + ddi_hotplug_trigger,
> + dig_hotplug_reg, hpd_icp,
> + icp_ddi_port_hotplug_long_detect);
> + }
> +
> + if (tc_hotplug_trigger) {
> + u32 dig_hotplug_reg;
> +
> + dig_hotplug_reg = I915_READ(SHOTPLUG_CTL_TC);
> + I915_WRITE(SHOTPLUG_CTL_TC, dig_hotplug_reg);
> +
> + intel_get_hpd_pins(dev_priv, &pin_mask, &long_mask,
> + tc_hotplug_trigger,
> + dig_hotplug_reg, hpd_icp,
> + icp_tc_port_hotplug_long_detect);
> + }
> +
> + if (pin_mask)
> + intel_hpd_irq_handler(dev_priv, pin_mask, long_mask);
> +
> + if (pch_iir & SDE_GMBUS_ICP)
> + gmbus_irq_handler(dev_priv);
> +}
> +
> static void spt_irq_handler(struct drm_i915_private *dev_priv, u32 pch_iir)
> {
> u32 hotplug_trigger = pch_iir & SDE_HOTPLUG_MASK_SPT &
> @@ -2804,8 +2878,11 @@ gen8_de_irq_handler(struct drm_i915_private *dev_priv, u32 master_ctl)
> I915_WRITE(SDEIIR, iir);
> ret = IRQ_HANDLED;
>
> - if (HAS_PCH_SPT(dev_priv) || HAS_PCH_KBP(dev_priv) ||
> - HAS_PCH_CNP(dev_priv))
> + if (HAS_PCH_ICP(dev_priv))
> + icp_irq_handler(dev_priv, iir);
> + else if (HAS_PCH_SPT(dev_priv) ||
> + HAS_PCH_KBP(dev_priv) ||
> + HAS_PCH_CNP(dev_priv))
> spt_irq_handler(dev_priv, iir);
> else
> cpt_irq_handler(dev_priv, iir);
> @@ -3584,6 +3661,9 @@ static void gen11_irq_reset(struct drm_device *dev)
> GEN3_IRQ_RESET(GEN11_DE_HPD_);
> GEN3_IRQ_RESET(GEN11_GU_MISC_);
> GEN3_IRQ_RESET(GEN8_PCU_);
> +
> + if (HAS_PCH_ICP(dev_priv))
> + GEN3_IRQ_RESET(SDE);
> }
>
> void gen8_irq_power_well_post_enable(struct drm_i915_private *dev_priv,
> @@ -3700,6 +3780,35 @@ static void ibx_hpd_irq_setup(struct drm_i915_private *dev_priv)
> ibx_hpd_detection_setup(dev_priv);
> }
>
> +static void icp_hpd_detection_setup(struct drm_i915_private *dev_priv)
> +{
> + u32 hotplug;
> +
> + hotplug = I915_READ(SHOTPLUG_CTL_DDI);
> + hotplug |= ICP_DDIA_HPD_ENABLE |
> + ICP_DDIB_HPD_ENABLE;
> + I915_WRITE(SHOTPLUG_CTL_DDI, hotplug);
> +
> + hotplug = I915_READ(SHOTPLUG_CTL_TC);
> + hotplug |= ICP_TC_HPD_ENABLE(PORT_TC1) |
> + ICP_TC_HPD_ENABLE(PORT_TC2) |
> + ICP_TC_HPD_ENABLE(PORT_TC3) |
> + ICP_TC_HPD_ENABLE(PORT_TC4);
> + I915_WRITE(SHOTPLUG_CTL_TC, hotplug);
> +}
> +
> +static void icp_hpd_irq_setup(struct drm_i915_private *dev_priv)
> +{
> + u32 hotplug_irqs, enabled_irqs;
> +
> + hotplug_irqs = SDE_DDI_MASK_ICP | SDE_TC_MASK_ICP;
> + enabled_irqs = intel_hpd_enabled_irqs(dev_priv, hpd_icp);
> +
> + ibx_display_interrupt_update(dev_priv, hotplug_irqs, enabled_irqs);
> +
> + icp_hpd_detection_setup(dev_priv);
> +}
> +
> static void gen11_hpd_detection_setup(struct drm_i915_private *dev_priv)
> {
> u32 hotplug;
> @@ -3733,6 +3842,9 @@ static void gen11_hpd_irq_setup(struct drm_i915_private *dev_priv)
> POSTING_READ(GEN11_DE_HPD_IMR);
>
> gen11_hpd_detection_setup(dev_priv);
> +
> + if (HAS_PCH_ICP(dev_priv))
> + icp_hpd_irq_setup(dev_priv);
> }
>
> static void spt_hpd_detection_setup(struct drm_i915_private *dev_priv)
> @@ -4168,11 +4280,29 @@ static void gen11_gt_irq_postinstall(struct drm_i915_private *dev_priv)
> I915_WRITE(GEN11_GPM_WGBOXPERF_INTR_MASK, ~0);
> }
>
> +static void icp_irq_postinstall(struct drm_device *dev)
> +{
> + struct drm_i915_private *dev_priv = to_i915(dev);
> + u32 mask = SDE_GMBUS_ICP;
> +
> + WARN_ON(I915_READ(SDEIER) != 0);
> + I915_WRITE(SDEIER, 0xffffffff);
> + POSTING_READ(SDEIER);
> +
> + gen3_assert_iir_is_zero(dev_priv, SDEIIR);
> + I915_WRITE(SDEIMR, ~mask);
> +
> + icp_hpd_detection_setup(dev_priv);
> +}
> +
> static int gen11_irq_postinstall(struct drm_device *dev)
> {
> struct drm_i915_private *dev_priv = dev->dev_private;
> u32 gu_misc_masked = GEN11_GU_MISC_GSE;
>
> + if (HAS_PCH_ICP(dev_priv))
> + icp_irq_postinstall(dev);
> +
> gen11_gt_irq_postinstall(dev_priv);
> gen8_de_irq_postinstall(dev_priv);
>
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index caad19f..cf5d67b 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -7417,7 +7417,7 @@ enum {
> #define SDE_TRANSA_FIFO_UNDER (1 << 0)
> #define SDE_TRANS_MASK (0x3f)
>
> -/* south display engine interrupt: CPT/PPT */
> +/* south display engine interrupt: CPT - CNP */
> #define SDE_AUDIO_POWER_D_CPT (1 << 31)
> #define SDE_AUDIO_POWER_C_CPT (1 << 30)
> #define SDE_AUDIO_POWER_B_CPT (1 << 29)
> @@ -7465,6 +7465,22 @@ enum {
> SDE_FDI_RXB_CPT | \
> SDE_FDI_RXA_CPT)
>
> +/* south display engine interrupt: ICP */
> +#define SDE_TC4_HOTPLUG_ICP (1 << 27)
> +#define SDE_TC3_HOTPLUG_ICP (1 << 26)
> +#define SDE_TC2_HOTPLUG_ICP (1 << 25)
> +#define SDE_TC1_HOTPLUG_ICP (1 << 24)
> +#define SDE_GMBUS_ICP (1 << 23)
> +#define SDE_DDIB_HOTPLUG_ICP (1 << 17)
> +#define SDE_DDIA_HOTPLUG_ICP (1 << 16)
> +
> +#define SDE_DDI_MASK_ICP (SDE_DDIB_HOTPLUG_ICP | \
> + SDE_DDIA_HOTPLUG_ICP)
> +
> +#define SDE_TC_MASK_ICP (SDE_TC4_HOTPLUG_ICP | \
> + SDE_TC3_HOTPLUG_ICP | \
> + SDE_TC2_HOTPLUG_ICP | \
> + SDE_TC1_HOTPLUG_ICP)
> #define SDEISR _MMIO(0xc4000)
> #define SDEIMR _MMIO(0xc4004)
> #define SDEIIR _MMIO(0xc4008)
> @@ -7525,6 +7541,30 @@ enum {
> #define PORTE_HOTPLUG_SHORT_DETECT (1 << 0)
> #define PORTE_HOTPLUG_LONG_DETECT (2 << 0)
>
> +/* This register is a reuse of PCH_PORT_HOTPLUG register. The
> + * functionality covered in PCH_PORT_HOTPLUG is split into
> + * SHOTPLUG_CTL_DDI and SHOTPLUG_CTL_TC.
> + */
> +
> +#define SHOTPLUG_CTL_DDI _MMIO(0xc4030)
> +#define ICP_DDIB_HPD_ENABLE (1 << 7)
> +#define ICP_DDIB_HPD_STATUS_MASK (3 << 4)
> +#define ICP_DDIB_HPD_NO_DETECT (0 << 4)
> +#define ICP_DDIB_HPD_SHORT_DETECT (1 << 4)
> +#define ICP_DDIB_HPD_LONG_DETECT (2 << 4)
> +#define ICP_DDIB_HPD_SHORT_LONG_DETECT (3 << 4)
> +#define ICP_DDIA_HPD_ENABLE (1 << 3)
> +#define ICP_DDIA_HPD_STATUS_MASK (3 << 0)
> +#define ICP_DDIA_HPD_NO_DETECT (0 << 0)
> +#define ICP_DDIA_HPD_SHORT_DETECT (1 << 0)
> +#define ICP_DDIA_HPD_LONG_DETECT (2 << 0)
> +#define ICP_DDIA_HPD_SHORT_LONG_DETECT (3 << 0)
> +
> +#define SHOTPLUG_CTL_TC _MMIO(0xc4034)
> +#define ICP_TC_HPD_ENABLE(tc_port) (8 << (tc_port) * 4)
> +#define ICP_TC_HPD_LONG_DETECT(tc_port) (2 << (tc_port) * 4)
> +#define ICP_TC_HPD_SHORT_DETECT(tc_port) (1 << (tc_port) * 4)
> +
> #define PCH_GPIOA _MMIO(0xc5010)
> #define PCH_GPIOB _MMIO(0xc5014)
> #define PCH_GPIOC _MMIO(0xc5018)
> --
> 2.7.4
>
--
Lucas De Marchi
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